Corrosion inhibition of imidazoline and porphyrin on hot-pressed impregnated diamond bits in NaCl solution
-
摘要: 采用电化学方法、失重测试和拉曼光谱研究咪唑啉和卟啉在pH为10、质量分数为20%的NaCl溶液中的热压孕镶金刚石钻头胎体材料的缓蚀行为。结果表明:咪唑啉和卟啉均能促进胎体材料表面钝化膜(主要是铜和铁的氧化物)的形成,能够起到缓蚀作用。由于咪唑啉在碱性条件下的水解作用,其在电化学测试中表现出的缓蚀率明显小于卟啉的。为期1周的失重测试表明,长时间的浸泡能够提高咪唑啉的缓蚀率至与卟啉相同的水平。Abstract: The corrosion inhibition behavior of imidazoline and porphyrin in hot pressing impregnated diamond bit matrix material in NaCl solution with pH10 and mass fraction of 20% was studied by electrochemical method, weight loss test and Raman spectroscopy. The results show that both imidazoline and porphyrin can promote the formation of passivation films (mainly copper and iron oxides) on the surface of matrix materials, which can play a role of corrosion inhibition. Due to the hydrolysis of imidazoline under alkaline conditions, the inhibition efficiency of imidazoline in the electrochemical test is significantly less than that of porphyrin. The one-week weightlessness test shows that prolonged soaking can increase the inhibitory efficiency of imidazoline to the same level as porphyrin.
-
Key words:
- impregnated diamond bit /
- matrix material /
- corrosive wear /
- corrosion inhibition /
- NaCl solution
点击查看大图
计量
- 文章访问数: 193
- HTML全文浏览量: 42
- PDF下载量: 8
- 被引次数: 0